Malicious PDF — malware analysis report

Static analysis result for SHA-256 28525d8aeb1a8cf7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-25 10:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b059a0137e3bbb6e1808d4c857dad47e SHA-1: 31299232838ee71024ca58b7292ad787dd49a6ca SHA-256: 28525d8aeb1a8cf7078ec49b982f9fdfbeea38957b5de3beb05384c2ac2ca744
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains numerous external URIs pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the presence of PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS suggests a malicious intent, likely phishing or malware delivery via a hosted PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/95139606202.pdf In PDF document text
    • http://dtyxbpzx.com/filespath/files/20210907134717.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/lupivane.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/95375204963.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/68835408198.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/subafi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/34b4afaa2cfc6c9846be40f5d6538e20/17463792308.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/ratak.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/96337809386.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/vurikasonuvosugasavowo.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/zikejajupilimebidajabax.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/mobijaxolagerilov.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/wamukes.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/gozubufazofukamupove.pdfIn PDF document text
    • http://jfe.hk/userfiles/89498195973.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/funipogujasasaz.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210909130138.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/jonakog.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c74f306b938606db0dd4e02775c49cc1/42223681549.pdfIn PDF document text
    • http://herve-coiffure.ci/files/lokiw.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/kaxizub.pdfIn PDF document text
    • http://ipceurope.be/assets/file/37436091491.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/94586745136.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/60565799359.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/24907238735.pdfIn PDF document text
    • https://cubic.is/userfiles/file/44195920722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=roblox+arsenal+megaphone+idPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B7 11028 bytes
SHA-256: 28f519bede30815f9c9e09c4d6397f981a2780f9a13995f107c4010cd78fc544
font_01_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 21668 bytes
SHA-256: 394ce6f5af4877cc0713d7d96f0063e9b87aa9f3f2356ceacbe230d8eb87531c